kmpdfkit_demo/example/lib/cpdf_reader_widget_security_example.dart

// Copyright © 2014-2025 PDF Technologies, Inc. All Rights Reserved.
//
// THIS SOURCE CODE AND ANY ACCOMPANYING DOCUMENTATION ARE PROTECTED BY INTERNATIONAL COPYRIGHT LAW
// AND MAY NOT BE RESOLD OR REDISTRIBUTED. USAGE IS BOUND TO THE ComPDFKit LICENSE AGREEMENT.
// UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS SUBJECT TO CIVIL AND CRIMINAL PENALTIES.
// This notice may not be removed from this file.

import 'dart:io';

import 'package:compdfkit_flutter/configuration/cpdf_configuration.dart';
import 'package:compdfkit_flutter/configuration/cpdf_options.dart';
import 'package:compdfkit_flutter/document/cpdf_watermark.dart';
import 'package:compdfkit_flutter/widgets/cpdf_reader_widget.dart';
import 'package:compdfkit_flutter/widgets/cpdf_reader_widget_controller.dart';
import 'package:compdfkit_flutter_example/utils/file_util.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';

class CPDFReaderWidgetSecurityExample extends StatefulWidget {
  final String documentPath;

  const CPDFReaderWidgetSecurityExample(
      {super.key, required this.documentPath});

  @override
  State<CPDFReaderWidgetSecurityExample> createState() =>
      _CPDFReaderWidgetSecurityExampleState();
}

class _CPDFReaderWidgetSecurityExampleState
    extends State<CPDFReaderWidgetSecurityExample> {

  CPDFReaderWidgetController? _controller;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,
        appBar: AppBar(
          title: const Text('CPDFReaderWidget Example'),
          leading: IconButton(
              onPressed: () {
                Navigator.pop(context);
              },
              icon: const Icon(Icons.arrow_back)),
          actions: null == _controller ? null : _buildAppBarActions(context),
        ),
        body: CPDFReaderWidget(
          document: widget.documentPath,
          configuration: CPDFConfiguration(
              toolbarConfig: const CPDFToolbarConfig(
                  iosLeftBarAvailableActions: [CPDFToolbarAction.thumbnail])),
          onCreated: (controller) {
            setState(() {
              _controller = controller;
            });
          },
        ));
  }

  List<Widget> _buildAppBarActions(BuildContext context) {
    return [
      PopupMenuButton<String>(
        onSelected: (value) {
          handleClick(value, _controller!);
        },
        itemBuilder: (context) {
          return actions.map((action) {
            return PopupMenuItem(
              value: action,
              child: SizedBox(width: 200, child: Text(action)),
            );
          }).toList();
        },
      ),
    ];
  }

  void handleClick(String value, CPDFReaderWidgetController controller) async {
    switch (value) {
      case 'Set Password':
        bool setPasswordResult = await controller.document.setPassword(
            userPassword: '1234',
            ownerPassword: '12345',
            allowsPrinting: false,
            allowsCopying: false,
            encryptAlgo: CPDFDocumentEncryptAlgo.aes256);
        debugPrint('ComPDFKit:set_user_password:$setPasswordResult');
        break;
      case 'Remove Password':
        bool removePasswordResult = await controller.document.removePassword();
        debugPrint('ComPDFKit:remove_user_password:$removePasswordResult');
        break;
      case 'Check Owner Password':
        bool result = await controller.document.checkOwnerPassword('12345');
        debugPrint('ComPDFKit:check_owner_password:$result');
        break;
      case 'Create Text Watermark':
        await controller.document.createWatermark(CPDFWatermark.text(
            textContent: 'Flutter',
            scale: 1.0,
            fontSize: 60,
            rotation: 0,
            horizontalAlignment: CPDFWatermarkHorizontalAlignment.center,
            verticalAlignment: CPDFWatermarkVerticalAlignment.center,
            textColor: Colors.red,
            pages: [0, 1, 2, 3]));
        break;
      case 'Create Image Watermark':
        File imageFile = await extractAsset(context, 'images/logo.png');
        await controller.document.createWatermark(CPDFWatermark.image(
          imagePath: imageFile.path,
          opacity: 1,
          scale: 1,
          rotation: 45,
          pages: [0, 1, 2, 3],
          horizontalAlignment: CPDFWatermarkHorizontalAlignment.center,
          verticalAlignment: CPDFWatermarkVerticalAlignment.center,
        ));
        break;
      case 'Create Image Watermark Pick Image':
        FilePickerResult? pickerResult = await FilePicker.platform
            .pickFiles(type: FileType.image, allowMultiple: false);
        if (pickerResult != null) {
          debugPrint('ComPDFKit:Document:${pickerResult.files.first.path}');
          await controller.document.createWatermark(CPDFWatermark.image(
            imagePath: pickerResult.files.first.path!,
            pages: [0, 1, 2, 3],
            scale: 0.3,
            horizontalAlignment: CPDFWatermarkHorizontalAlignment.center,
            verticalAlignment: CPDFWatermarkVerticalAlignment.center,
          ));
          return;
        }
        break;
      case 'Remove All Watermarks':
        await controller.document.removeAllWatermarks();
        break;
      case 'Document Info':
        var document = controller.document;
        debugPrint(
            'ComPDFKit:Document: fileName:${await document.getFileName()}');
        debugPrint(
            'ComPDFKit:Document: checkOwnerUnlocked:${await document.checkOwnerUnlocked()}');
        debugPrint(
            'ComPDFKit:Document: isEncrypted:${await document.isEncrypted()}');
        debugPrint(
            'ComPDFKit:Document: getPermissions:${await document.getPermissions()}');
        debugPrint(
            'ComPDFKit:Document: getEncryptAlgorithm:${await document.getEncryptAlgo()}');
        break;
    }
  }
}

var actions = [
  'Set Password',
  'Remove Password',
  'Check Owner Password',
  'Create Text Watermark',
  'Create Image Watermark',
  'Create Image Watermark Pick Image',
  'Remove All Watermarks',
  'Document Info'
];